Improvement in hot-he furnaces



0; B. GREGORY HotAi-r Furnace. 'Nq. 31,492. v wanted-A r l 25,1868;

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0,13 GREGORY, oE BEVERLY, NEW JERSEY.

Letters Patent No. 81,492, dated August 25, 186.8.

IMPROVEMENT IN HOT-AIR FURNACES.

011p dgrtuh rzfemt in ilt flpsr tems new art muting hitti of the same.

TO ALL WHOM IT MAY CONCERN:

13d it known that I, C. B. GREGOEY, of Beverly, Burlington county, NewJersey, have invented certain Improvements in Heating-Furnaces; and-I dohereby declare the following to be n full, clear, and exact descriptionof the same. 7

My invention consists, firstly, of a chamber, arranged above thefireplace of a furnace, and having tubes open at each end,,and extendingacross it, for the passage of the air to be heated, as fully describedhereafter; secondly, of perforated gas-plates,so arranged that they maybe raised simultaneously above the fireplace, and thus aiford a moreextended opening for the passage of air to the interior of the same.

In order to enable others skilled'in the art to make and apply myinvention, I will now proceed to describe its construction andoperation, reference, being had to the abfcompanying drawing, whichforms a part of this specification, and in which Figure 1 is alongitudinal sectional view of my improved heating-furnace.

Figure2, a' transverse vertical section of the same, on the line 1 2,fig. 1.

Figure 3, a sectional plan view, on theline 3 4, fig. 1

Figure 4, a detached view, illustrating a portion of my invention andFigure 5 a view representing a modification ofpart of my invention.

Similar letters refer to similar parts throughout the several'views.

A is the front plate, B the bottom, 0 O the opposite sides, and D theback of the furnace.

At the bottom ofthe front plate A is a door, adapted to the opening ofthe ash-pit b, and at the rear end of the latter is the usual dust-fluec, communicating with the main fiue E of the'fui'nacea On each of theopposite sides and back, D, of the furnace, and near to the upper end ofthe ash-pit, is a flange, 02, upon which rest'the clay walls, e, e, ande of the fireplace f.

The grate F is hung to and operated by a rod, k, which projects throughthe front wall of the furnace, and in the latter is the usual fire-doork. I

A space or chamber, g, which extends along the back and both sides ofthe furnace, intervenes between the same and the fire-clay walls e e,and the said space may be-filled with gravel or other granulatedmaterial, as described in the p'atentgranted to me on the third day ofMarch, 1868.

Above the chamber g, and almost in contact with the wall 6 and side, 0,of the furnace, is an angular plate, It, perforated with a number ofsmall holes, and hung on pins or trunnions i i, the bearings of whichare in the side walls 0, one of the pins being prolonged to forms.handle, 2'.

At the back of the fireplace is a similar plate, k, which is turned bymeans of a projection, j, of the plate It, shown in dotted lines, fig.4, when the latter is operated byits rod 2'. A third plate, It, is hungabove the wall and is operated in a similar manner by the plate It, thethree plates movingsimultaneously on turning the rod 2', as will beexplained hereafter.

In the upper part of the furnace, and communicating with thefireplacc,f, is a chamber, H, having, in the present instance, east-ironends, Z Z, and a rounded top and sides, m, of thin sheet metal, securedto the ends I, and to the front and side plates of the furnace.

Extending longitudinallythrough the chamber H, and secured-to the ends IZ of the same, are a number of tubes, 12, open at each end, as shown infig. 1, and infront of the furnace, opposite to these tubes, is adoor,g, and in the end, Z, of the chamber, two openings, 9* r, fora purposedescribed hereafter, (see fig. 4.) v

The furnace above described is contained within an outer casing, X, ofbrick-work, shown by red lines, and between this casing and the furnaceintervenes a space which is divided by a partition, s, into twocompartments or chambers, a: and a, the former of whch is open at thetop, as shown in fig. 1.

When a fire is ignited upon the grate F, cold air is admitted at one ormore points in the front of the furnabe to the space g, which surroundsthe-fireplace, and passes through the perforations of the plates h h h,to aid'in the combustion of the gases which rise from the. burning fuel.

' When soft coal or other fuel is used, that requires a greater quantityof air than can pass through the perforated plates, the latter areturned upon their rods 1', by operating the handle 1', and thus raised,as shown in fig. 4, in order to allow a suflicient volume of air to passbeneath them into the fireplace.

By means of the above arrangement, the plates k can be turned andadjusted to the proper position to admit the quantity of air required.

The heatedproducts of combustion from-the fireplace do not pass directlyinto the flue E, but are directed upwards by the bridge-wall-t, fig. 1,into the chamber H, where, after freely circulating among the tubes 12,they pass downwards over the bridge-wall, as indicated by the arrows,and thence into the flue E.

The cold air to be heated is admitted into the compartment 9;, of theouter casing of the furnace, passes downwards into the space between thefront plate A and end I of the heating-chamber, and enters the open endsof the tubes 12, as shown by the arrows, fig. 1.

The air, in passing through these tubes, is exposed to the direct actionof the heated products of combustion, circulating through the chamber H,so that by the time it passes from the rear end of the tubes into thecompartment x of the outer casing of the furnace, it is in a highlyheated state. 7

The air circulates in this latter compartment, and is exposed to theheated surfaces of the top and sides of the chamber H and of the flue E,and finally passing off through the usual flues to the rooms of thebuilding tube-heated.

By causing the air that is tobeheated to enter at the top of thefurnace, as above described, the coldest air passes to the bottom of thecompartment 2:, and through the lowest row of tubes 12, being therebymore directly exposed to the action of the fire, and as efl'ectuallyheated as the air which passes through the upper tubes.

To facilitate the passage of air through the-tubes p, the latter may, ifdesired, be slightly elevated at their rear ends, or their diameter maybegradually increased towards this point.

In either case, the air, in passing through tubes which are horizontal,or nearly so, will be retarded in its flow and consequently will he moreefl'ectually heated than when it passes through vertical tubes.

The tubesp are so secured to the ends Z Z of the gas-chamber, that wheninjured or worn out, they'may be detached from the same, and removedthrough the door q, and as readily replaced.

The interior of the tubes can be readily cleaned by a brush or otherinstrument, inserted through the door q,za,nd when a quantity of dustsettles-upon the exterior of the tubes, within the gas-chamber, it maybe removed by a brush inserted through the openings 11 1', (see fig. 3.)

The modification of my invention, shown in fig. 5, represents a plan ofraising the gas-ring above the cylindrical fire-pot, in an ordinaryheating-stove. In this case, the fire-pot is provided on its upper edgewith projections, t, having inclined faces, and adapted to correspondingrecesses on the under edge of the gas-ring, so that the latter mayeither rest upon the fire-pot, or may be raised above the same, onslightly turning it, as shown.

In the above furnace, a thorough consumption of the fuel is insured; theair is exposed to an extended heating-surface, and the various parts ofthe furnace can be readily reached when it is necessary to repair orclean them.

I claim as my invention, and desire to secure by Letters Patent- 1. Thearrangement of the fireplace, chamber H, with its tubes 12, chamber 2;,and the flue E, as and for the purpose specified. I

2. Perforated plates, arranged above the sides of a fire-pot, so thattheir lower edges may be raised from contact with the fire-pot, for thepurpose set forth.

In testimony whereof, I have signed my name to this specificationin thepresence of two suhscribingwitnesscs.

' C. B. GREGORY.

Witnesses:

Jenn WHITE, 0. B. Pnros.

